Process of making adhesive material.



C. H. CROWELL.

PROCESS OF MAKING ADHESIVE MATERIAL.

APPLICATION FILED NOV. 4, 1915.

1,300,250. Patented Apr. 15,1919.

O G O ff To all whom it may concern:

CHARLES H. CROWELL, OF BROOKLYN, NEW YORK.

PROCESS OF MAKING ADHESIVE MATEBIAL- I Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed November '4, 1915. Serial No. 59,673.

Be it known that I, CHARLES H. CRowELL', a citizen of the United States,residing at Brooklyn, county of Kings, Stateof New York, have invented acertain new and useful Improvement in Processes of Making AdhesiveMaterial, of which the following is a specification, reference being hadtherein to the accompanying drawings.

My invention relates to a method of manufacturing the novel adhesivematerial fully described in an application filed November 4, 1915,Serial No. 59,672.

In that application, I have described in detail an adhesive materialcomposed of animal glue, .insp'issated vegetable juices, a solventcomposed of tartaric, acetic, and citric acids and Water, and a smallquantity of sodium chlorid. I Said adhesive when completed is preferablyin the form of a sheet or tape without a fabric or paper backing and isdry and non-adhesive at ordinary atmospheric temperatures, but becomesfluid 2nd strongly adhesive on the application of cat.

My invention will be fully understood by reference to the followingdescription taken in connection with the accompanying drawings, and thenovel features thereof are pointed out and clearly defined in the claimsat the close of this specification. M

In the drawing the figure is a side elevation of an apparatus by meansof which certain steps of the herein described process are practised. Itwill be understood that it-is necessary to heat or cook as a partof themethod of manufacture of the mixture but it has not-been thoughtnecessary to illustrate any device for performing this step as theordinary open jacketed steamkettle may be employed. c

In the manufacture of my adhesive in accordance with the hereindescribed process,

I dissolve five per cent. of sodium chlorid in the acid solvent, equalportions ofanimal glue and this solvent containing the chlorid of sodiumare then put together and allowed to-soak five or six hours, or evenlonger, forming a glue'je'lly. Two parts of the inspissated vegetablejuices and one part of the acid solvent mixture such as stated arecookedsyrup mixture are then'mixed in the proportion of about two parts of theglue jelly to one of the cooked syrup mixture in a jacketed kettle andheated to a temperature of about 160 to 180 Fahr. being ma1ntained atthis temperature and thoroughly stirred for about two hours.

The mixture thus produced is placed in a jacketed trough or basin 11inwhich the mixture is maintained at a proper temperature to keep it inliquid form and at the same time to drive off as little of the solventcontained therein as possible. A roll 12 is mounted to revolve in thebasin, the lower part of the roll dipping in the mixture. At 13 is showna doctor or scraper arranged on one side of the roll and adjustable bymeans of the screw l t to or from the periphery of the roll so as toallow the operator to control the thickness of the layer of adhesivematerial taken up by the roll as it revolves.

On the opposite side of the roll from the doctor, is an inclined scraper15, the top edge.

- of which is pressed against the roll 12. This inclined scraper is atan angle of about 45 and has raised sides to keep the adhesive materialfrom running over the edges as it runs down the incline of the scraper.Below this scraper 15, is an endless metal belt 16 which travel-sforward at a correct speed so that the adhesive material is laid in acontinuous web 30 on this belt or apron. The thickness of the web isvaried according to the position at which the doctor or scraper is setwith relation to the surface of the roll 12. At 17 are shown coolingpipes by which the apron 16 is-maintained at a low temperature so thatit instantly chills the adhesive. The metal apron 16 is of considerablelength and inclosed in a box 18 through which a current of air iscirculated by a fan 19, to produce a slight drying action by removing asmall amount of the moisture from the sur-, face of the Web of adhesivematerial. A small amount of oil or some other suitable substance isapplied to the surface of the traveling apron to prevent the webadhering to it. This oil is applied to the outer side of the metal apronby means of a felt covered roll 22 and any surplus is removed by asimilar roll 23:

At the end of the apron farthest from the roll 12 is located a trough 20by'which there is applied to the top surface of the strip of At 24 isshown a soft felt or bristle roll which removes from the surface of theWeb of adhesive material the surplus powder and also fubs or polishesthe surface imparting to it a texture something like that of rubbertissue. After passing the roll 24 the web of adhesive material passesaround the guide rolls 25 and 26 and then under the second trough 27which deposits powder 28 on the opposite side of the strip. At 29 isshown a roll similar to the roll 24 which treats the surfaceun the sameway, the Web of adhesive, material being at this time supported on a ofthe ingredients and allowing them to soak for a period of time to form aglue jelly, cooklng a mixture of other ingredients until the said-mixture congeals quickly when dropped in cold water and mixing the saidglue jelly with said cooked mixture and then heating the combinedmixture, then forming a Web of said combined mixtures after they havebeen heated.

2. The method of making a web of adhesive which consists in mixingtogether some of the ingredients and allowing them to soak for a periodof time to form a glue jelly, cooking a mixture of other ingredientsuntil the said mixture congeals quickly when dropped in cold water andmixing the said glue jelly with said cooked mixture and then heating thecombined mixture, then forming a 'Web of said combined mixtures afterthey have been heated, and then chilling the web to harden the same.

In testimony whereof I afiix my signature, in presence of two witnesses.

CHARLES H. CROWELL.

Witnesses:

GEORGE P. DIKE, ALICE H. MORRISON.

